In this passage we see that the suitors’ lack of kharis in their dealings with Odysseus’ household is repaid by an akharistos meal, one that has no kharis (as the term applies to the reciprocal exchange of good turns; see O.24.281-286 and my comment there for this meaning of kharis). Although the end of the passage, “for they were the first to contrive unseemly things” (O.20.394), appears to explain the meal’s lack of kharis as a result of Athena’s and Odysseus’ initiative in unjust machinations, according to Penelope, the suitors have done ἀεικέα ἔργα, “unseemly deeds,” before this. Furthermore, she connects the suitors’ unseemly deeds directly with a lack of kharis in return for good deeds (O.4.694-695, where see my comment). The lack of kharis in this meal as the reciprocation of the lack of kharis in the suitors’ feasting in Odysseus’ house, therefore, is another manifestation of the interconnections of kharis, reciprocity and social order, and the concerns regarding them that run through the fabric of the Odyssey.
See further:Seaford, Richard. 1994. Reciprocity and Ritual: Homer and Tragedy in the Developing City-State. Oxford: Clarendon Press; New York: Oxford University Press.